Neu-Isenburg Castle

Neu-Isenburg was built around 1240 by Count Dietrich von Altena-Isenberg, named after the Hattingen Isenburg, which was destroyed in 1226. Its construction was part of the Isenberg Feud, in which Dietrich sought to assert his hereditary claims to possessions and vogtships, particularly over the abbeys of Werden and Essen, against his uncle Heinrich IV von Limburg, Count Adolf I von der Mark, and the Archbishop Konrad von Hochstaden of Cologne. The castle was besieged and captured by Archbishop Konrad von Hochstaden as early as 1244. It subsequently served as a Cologne outpost and prison until it was razed by Count Eberhard I von der Mark in 1288 and subsequently fell into ruin.